Triage reminder to sheperd resolved MRs that have not been merged before the feature freeze date

We have some MRs that are stuck in review at cut off. Some of these maybe merged ready but not being handled or missed on the 7th.

An MR that is opened with discussions but all of they have been resolved.
On these MRs detect them on the 5th, 6th before the freeze date and remind authors or maintainers to merge.